David Ross is considered perhaps the best backup catcher in baseball. And now he is joining the Boston Red Sox.

Ross reached agreement Saturday with the Red Sox on a two-year, $6.2 million free-agent contract, according to major-league sources.

Ross will be “more than a backup but not a starter” for the Red Sox, according to one source. The Sox could move one of their current catchers, Jarrod Saltalamacchia or Ryan Lavarnway. The team’s plans are unclear.

The deal will become official once Ross passes a physical, ending his four-year tenure with the Atlanta Braves.

I suspect that Red Sox Nation is going to love Ross the way that Yankees fans loved Ron Hassey back in 1985 and 1986.